table {
  border-collapse: collapse; /* 合并边框 */
  width: 100%; 
}
th {
  background-color: #f2f2f2;
}
th, td {
  border: 1px solid black;
  padding: 8px; 
  text-align: center; 
}
.pages{
  margin-top: 50px;
}

